I had 52 of these in the log after testing for an hour or so with 5.0 beta.
https://www.undisclosed.com/index.php?action=downloadsApply Filter: Only show the errors with the same message
8: Undefined index: downloads
Apply Filter: Only show the errors from this file
File: /homepages/undisclosed.com/web_root/Sources/Downloads2.php
Line: 10340
https://www.undisclosed.com/index.php?action=downloadsApply Filter: Only show the errors with the same message
2: Invalid argument supplied for foreach()
Apply Filter: Only show the errors from this file
File: /homepages/undisclosed.com/web_root/Themes/default/index.template.php
Line: 485